Differential RNA Editing of Mitochondrial Genes in WA-Cytoplasmic Based Male Sterile Line Pusa 6A, and Its Maintainer and Restorer Lines
Received date: 2018-07-19
Accepted date: 2018-10-10
Online published: 2019-05-24
RNA editing changes the nucleotides at the transcript level of mitochondrial genes which results in synthesis of functional proteins. This study was designed to find the editing sites which could be implicated in male fertility restoration and to develop editing based markers for differentiation of cytoplasmic male sterility and maintainer lines from each other. DNA and RNA from young panicles were isolated from three-line system of hybrid rice PRH10, wild abortive (WA) cytoplasm based male sterile (A line Pusa 6A), maintainer (B line Pusa 6B) and restorer (R line PRR78) lines. Pusa 6A and PRR78 having the same WA cytoplasm are allo-nuclear and iso-cytpolasmic lines. The genomic and cDNA amplicons for eight mitochondrial genes (18SrRNA, atp6, atp9, cobII, coxI, coxIII, nadI and rps3) were sequenced and compared. Differences in genomic and cDNA sequences were considered as editing. Two hundred and thirty editing sites having base substitution or insertion/deletion were identified with the highest in 18SrRNA (5.74%) and the lowest in coxI (0.60%). The highest editing sites were observed in fertile maintainer Pusa 6B followed by PRR78 and Pusa 6A, of which random five editing sites in five different rice mitochondrial transcripts namely atp9, cobII, coxIII, rps3 and 18SrRNA were chosen and validated through cleaved amplified polymorphism sequence (CAPS) analysis and found to be partially edited in four genes. The identical editing sites of different mitochondrial genes from maintainer and restorer lines might reflect their possible contribution to fertility restoration of sterile WA cytoplasm.
Ngangkham Umakanta, Kumar Parida Swarup, Kumar Singh Ashok, Mohapatra Trilochan . Differential RNA Editing of Mitochondrial Genes in WA-Cytoplasmic Based Male Sterile Line Pusa 6A, and Its Maintainer and Restorer Lines[J]. Rice Science, 2019 , 26(5) : 282 -289 . DOI: 10.1016/j.rsci.2019.08.002
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